Application of additive in enhancing oxidization of arsenical gold mineral by bacteria

A technology of bacterial oxidation and additives, applied in the direction of improving process efficiency, etc., can solve the problems of bacterial poisoning and affecting the normal reproduction and growth of bacteria, and achieve the effect of strengthening bacterial oxidation, low cost and remarkable effect

Active Publication Date: 2012-08-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it is found that various oxidants that are beneficial to the oxidation of As(III) in a sterile system include hydrogen peroxide, sodium hypochlorite, ferric chloride, potassium permanganate and ozone, etc., but these oxidants are all strong oxidants or sterilizers. Agents, after being introduced into the bacterial system, will have a toxic effect on the bacteria and affect the normal reproduction and growth of the bacteria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: in 250mL Erlenmeyer flask, add 150mL9K substratum and add the arsenopyrite of 5.0g, then inoculate 10mL of acidophilic Thiobacillus ferrooxidans (bacteria adopt common acidophilic ferrous oxide for leaching ore Thiobacillus, cultivated using conventional 9k medium, the number of bacteria reached 10 after mass reproduction 8～9 individual / ml), adjust the pH of the pulp to 1.8. Cultivate at a constant temperature of 30° C. in an air bath shaker, the shaker rotates at a speed of 160 r / min, and the additive (ammonium persulfate) is added while the bacteria are inoculated, and the stirring oxidation time is 144 hours. When the addition amount of the additive is 20% of the total weight of the arsenic-containing gold ore, the arsenic oxidation rate of the arsenic-containing gold ore is 40.4%, and the conversion rate of As(III) is 30.41%.

Embodiment 2

[0015] Example 2: Add 150 mL of 9K medium and 5.0 g of arsenopyrite to a 250 mL Erlenmeyer flask, then inoculate 10 mL of the same acidophilic Thiobacillus ferrooxidans as in Example 1, and adjust the pH of the slurry to 1.8. Cultivate at a constant temperature of 30° C. in an air bath shaker, the shaker speed is 160 r / min, the additive (ammonium persulfate) is added while the bacteria are inoculated, and the stirring oxidation time is 120 h. When the additive amount is 50% of the total arsenic-containing gold ore, the arsenic oxidation rate of the arsenic-containing gold ore is 95%, and the conversion rate of As(III) is 38.43%.

Embodiment 3

[0016] Example 3: Add 150 mL of 9K medium and 5.0 g of arsenopyrite to a 250 mL Erlenmeyer flask, then inoculate 10 mL of the same acidophilic Thiobacillus ferrooxidans as in Example 1, and adjust the pH of the slurry to 1.8. Cultivate at a constant temperature of 30°C in an air bath shaker, the shaker rotates at a speed of 160r / min, add the additive (ammonium persulfate) after bacterial leaching for 48 hours, and continue leaching for 120 hours. When the additive amount is 20% of the total amount of arsenic-containing gold ore, the oxidation rate of arsenic in the arsenic-containing gold ore is 35.1%, and the conversion rate of As(III) is 48.8%.

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Abstract

The invention provides an application method of an additive in enhancing oxidization of arsenical gold mineral by bacteria. The additive is ammonium persulfate, and the dosage is 20-50% of total amount of the arsenical gold mineral. Two adding modes are adopted, the first adding mode is adding to a leaching system together with bacteria liquid, and the second adding mode is adding to the leachingsystem after bacterial leaching for a certain period of time. When the first adding mode is adopted, the additive mainly contains oxidized arsenical pyrite, the dosage of the additive is increased to50% from 0%, and the oxidation rate of the arsenical pyrite is increased to 95% from 8.7%. When the second adding mode is adopted, the additive mainly contains As(III) in oxidizing solution, the dosage of the additive is increased to 50% from 0%, and the oxidation rate of As(III) is increased to 91.12% from 4.9%. Reproduction and activity of the bacteria are not affected after the additive is added; the oxidation of the arsenical pyrite or As(III) can be obviously enhanced in an oxidization process; the problem of toxicity of a biological oxidation product can be solved, and the application method becomes an important measure for increasing the speed of oxidizing the arsenical gold mineral by the bacteria.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and relates to an application method of additives in strengthening the oxidation of arsenic-containing gold ore bacteria, so as to realize the high-efficiency oxidation of arsenic-containing, especially high-arsenic, gold ore bacteria, thereby creating favorable conditions for gold extraction of arsenic-containing gold ore . Background technique [0002] With the massive development and utilization of gold resources, refractory gold ore has gradually become the main raw material for gold extraction. my country's arsenic-containing gold ore resources are relatively rich and widely distributed in all gold-producing provinces. Many refractory gold and silver ores contain varying amounts of arsenic, often in the form of arsenopyrite and FeAsS. At present, the methods for processing such gold mines mainly include roasting method, high pressure oxidation method and bacterial oxidation method. During oxi...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B11/00
CPCY02P10/20
Inventor 李骞姜涛杨永斌邓琼苑洪晶范晓慧李光辉郭宇峰陈许玲张元波张雁杨勰
Owner CENT SOUTH UNIV
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